Ellen DeGeneres has apologised to Jenna Dewan during an episode of her show for accidentally referring to the star as “Jenna Dewan-Tatum.”

Dewan and her husband, actor Channing Tatum, announced on April 2 that they “lovingly” chose to separate.

Dewan reportedly changed her surname later that month on social media, going from “Dewan-Tatum” to “Dewan,” People explains.

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The awkward moment happened onstage when Ellen said: “Now we are going to bring out your fellow judges and host for your show ‘World of Dance,’ Jenna Dewan-Tatum — Jen — and Jenna Dewan, sorry — Derek Hough, and Ne-Yo,”

After chatting, DeGeneres paused to address her slip-up with Dewan on stage.

“I have to say before we go to break, um, I — I’m so sorry,” she admitted. “I introduced you and I — it was just such a habit, and I have to say the way that you and Channing are handling everything is beautiful and for your daughter and the statements have been great.”

She continued, “And I apologise, that I just have known both of you for long, and I’m so used to saying -- ”